Mariners right-hander Bryce Miller may not be available for the start of the season. Per Ryan Divish of The Seattle Times, Miller felt some soreness in his left side today and didn’t finish his bullpen session. “He’s definitely behind,” Mariners general manager Justin Hollander said. “It’s the type of injury where it seems wise not to push him too fast. Obviously, we won’t make any decisions until we need to.”
Miller was slowed by some left side soreness about two weeks ago. An MRI revealed some inflammation and he was given a platelet-rich plasma injection. His planned bullpen session today was part of a ramp-up that could have seen him stretched out for the start of the season. This setback appears to put that in jeopardy. He is not being fully shut down, as he will still be playing catch and doing some other activities, but the Mariners will want the soreness to clear before he fully lets it fly from a mound again.
It doesn’t seem like this is a major issue but it could be an early test of Seattle’s rotation depth. The Mariners have a strong starting group when everyone is healthy, as they have Logan Gilbert, George Kirby, Bryan Woo, Luis Castillo and Miller. Once they have to dip into their depth, things get a bit more questionable. Divish mentions Cooper Criswell and Emerson Hancock as the two guys most likely to step up if Miller does miss some time.
Criswell’s best season to date was his 2024 showing with the Red Sox. He tossed 99 1/3 innings in a swing role, allowing 4.08 earned runs per nine. His 17.2% strikeout rate was subpar but he only walked 7.3% of opponents and induced grounders on 50.3% of balls in play. In 2025, the Sox added some arms and Criswell was mostly blocked, only making seven big league appearances. He had a decent showing in Triple-A, throwing 65 2/3 innings with a 3.70 ERA, 24.5% strikeout rate, 10.1% walk rate and 49.4% ground ball rate.
Despite the passable numbers, Criswell exhausted his final option in 2025, pushing him to fringe roster status. The Sox signed him to a 2026 deal with an $800K salary, a bit above the $780K league minimum, even though he hadn’t yet qualified for arbitration. The plan seemed to be to pass him through waivers, allowing him to serve as Triple-A depth even though he’s out of options. That plan didn’t work, as the Mets claimed him off waivers in December. When the Mets nudged him off their roster, Seattle sent some cash to Queens to get him from DFA limbo.
Criswell’s number are fine but there’s a bit of risk there. His velocity doesn’t reach 90 miles per hour, making him a soft-tosser in this era. He has been able to get guys out regardless, but it’s a fine line to walk.
Hancock is a former sixth overall pick but his big league performance hasn’t lived up to that status yet. Over the past three years, he has given the M’s 162 2/3 innings with a 4.81 ERA, 15.6% strikeout rate, 7.6% walk rate and 40.1% ground ball rate.
One thing that may perhaps work in Criswell’s favor is that Hancock still has an option, so he could be sent to Triple-A to stay stretched out there. Since Criswell is out of options, he needs to either be in the rotation or the bullpen. If Criswell does end up with the rotation spot, that would help alleviate the pressure in the bullpen. Seattle’s eight projected relief arms are all out of options except for Matt Brash and Jose A. Ferrer, who are too good to be sent down.
If Hancock and Criswell are both up in the big leagues, Blas Castano would be the only optionable depth starter in the Triple-A rotation. He has just one major league appearance on his track record and posted a 5.19 ERA in Triple-A last year. The Mariners have Dane Dunning, Jhonathan Díaz, Randy Dobnak and Casey Lawrence in camp as non-roster invitees with some big league experience.
Photo courtesy of Rick Scuteri, Imagn Images
